L2F, L2TP, GRE, and MPLS VPNs do not provide data integrity, authentication, and data encryption. On the other hand, you can combine L2TP, GRE, and MPLS with IPsec to provide these benefits.
(source: Official Cert Guide to SCOR 350-701 from Omar Santos)
The question is asking which "SUPPORTS" which means they are not secure by itself.
C. Generic Routing Encapsulation Protocol
D. Layer 2 Tunneling Protocol
C and D are correct. The given answers are their non secured version of their counterpart. GRE can be used with IPSEC certainly. and so can layer 2 tunnel protocol PPTP.
PPTP / IPSEC = GRE and L2TP
A and D are the answers. GRE does not provide data encryption.
"VPN protocols that use IPSec encryption include L2TP, IKEv2, and SSTP"
https://www.comparitech.com/blog/vpn-privacy/ipsec-vs-ssl-vpn/
"While GRE provides a stateless, private connection, it is not considered a secure protocol because it does not use encryption like the IP Security (IPsec) Encapsulating Security Payload (ESP), defined by RFC 2406."
https://www.techtarget.com/searchnetworking/definition/Generic-Routing-Encapsulation-GRE
Sorry I meant C and D are correct.
https://en.wikipedia.org/wiki/Generic_Routing_Encapsulation
https://en.wikipedia.org/wiki/Layer_2_Tunneling_Protocol
in link you provided says:
"PPTP is often replaced by Layer 2 Tunnelling Protocol (L2TP) which is another VPN protocol that provides security using IPsec, and PPTP has also been made obsolete by L2TP and IPsec."
upvoted 2 times
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